Conference bulova::decw_jan-89_to_nov-90

2188.0. "Image display problem using DECwindows + PC-DECwindows." by KETJE::DE_BOEVER (DESKtop Integration program mgr. Belgium) Fri Feb 02 1990 09:58

Hello,

Apparently there seems to be a problem with the interaction between 
DECwindows on VMS and PC-DECwindows. See the included conference below which
was copied from the PCDECwindows notes file. Can anyone of you give us a clue ?

Regards,
Jan.

           <<< MOSAIC::$2$DUA8:[NOTES$LIBRARY]PCDECWINDOWS.NOTE;1 >>>
                               -< PC DECwindows >-
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Note 305.0            DECwrite problem with scanned images             2 replies
KETJE::DE_BOEVER "DESKtop Integration program mgr. Belgium"  19 lines  24-JAN-1990 05:18
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PC DECwindows V2.0 is great on my European DECstation-350 (Olivetti). However 
did stumble upon a few problems whem running DECwrite.

In our demo environment we show the possibilities to exchange documents,
images, spreadsheets among various platforms using CDA converters etc...
When we create a DECwrite document with a link to an image that image is
distorted. You see the overall shape of the image but apparently the pixels are
inverted within boxes of about the shape of a character cell. It's difficult to 
explain in words. It seems like a big-endian/little-endian problem. That same
document with the link to the image displayed on a DECstation-xxxx or a 
VAXstation displays without problem.

Another problem is that the display of a chart (link to a chart) does display 
that chart but with some horizontal lines crossing the chart. Those lines are
not seen when displayed on a DECstation-xxxx or a VAXstation.

If needed I can send a copy of the Document with the images included.

Jan.
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Note 305.1            DECwrite problem with scanned images                1 of 2
RAINBO::PETERSON                                     16 lines  24-JAN-1990 08:53
           -< PC X servers use LSByteFirst and MSBitFirst in images >-
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The problems with the bit order in images is the fault of DECwrite.
The video RAM uses least-significant-byte-first ordering of bytes within
words, and most-significant-bit-first ordering of bits within bytes.
The bit order is just backwards of the bit order on the DEC workstations.
The X server makes this information availible to the application.  It
is the application's responsibility to convert images if neccessary.

There were a lot of these "bit-order" problems with the V1 DECwindows
applications.  The developers have fixed most of them, but there still
seem to be a few.  You  might want to make sure that you have the
latest releases of the applications.

The problem of horizontal lines across the screen sounds like a server
bug.  Which server were you running, DWDOS286 or DWDOS386?

- Jim
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Note 305.2            DECwrite problem with scanned images                2 of 2
KETJE::DE_BOEVER "DESKtop Integration program mgr. Belgium"  7 lines  28-JAN-1990 14:51
                       -< VMS V5.3 and DWDOS286 (V2.0). >-
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    Thanks for your reply. 
    
    1. Yes we are using the latest versions (VMS V5.3).
    
    2. Concerning the displaying of the spreadsheet. I was using DWDOS286.
    
    Jan.